Atomics

Test #1 Review: Atomic Concepts

TEST TOMORROW 10/7!

​Atomic Theory Discoveries

​JJ Thompson

​- Discovered electrons (negative)

​

​Rutherford

​- Discovered nucleus is positive and contains protons

​- atom is mostly empty space

​

​Neils Bohr

​-planetary model

​Subatomic Particles

​Protons

​- positive charge

​- equal to the atomic number

​

​Electrons

​- negative charge

​- equal to the atomic number

​

​Neutrons

​- no charge

​- equal to the atomic mass - atomic number

Multiple Choice

Which device did JJ Thomson use to discover the electron?

• X-ray machine

• scanning tunneling electron microscope

• spectrometer

• cathode ray tube

Multiple Choice

JJ Thomson was credited for the discovery of the

• center of the universe

• proton

• electron

• neutron

Multiple Choice

Which is a finding attributed to Rutherford's Gold Foil Experiment?

• atoms are indivisible and have a dense positive nucleus.

• atoms are divisible and have multiple layers of electrons scattered uniformly about the atom.

• atoms are like plum pudding with positive and negative charges uniformly scattered throughout the atom.

• atoms are mostly empty space with a dense positive nucleus.

Multiple Choice

What evidence did Rutherford use to support the idea that the atom was mostly empty space?

• the vast majority of the alpha particles went through the foil unaffected.

• the vast majority of the alpha particles were deflected at 90 degrees.

• one alpha particle was deflected by the gold foil.

• beams of alpha particles were deflected by magnets.

Multiple Choice

According to the planetary model of the atom, electrons_____?

• are all packed inside the nucleaus of the atom

•  freely move in and out of the nucleus 

• revolve around the nucleus in specific orbits

•  electrons do not exist, atoms only contain protons and neutrons

Multiple Choice

Which subatomic particle has a positive charge?

• proton

• neutron

• electron

• midichlorian

Multiple Choice

The nucleus of an atom contains which subatomic particles?

• protons and electrons

• protons and neutrons

• electrons and neutrons

• protons, electrons, and neutrons

Multiple Choice

What is the number of protons?

• 34
• 16
• 18
• S

Multiple Choice

What is the number of neutrons?

• 34
• 79
• 45
• 35

​Isotopes

​Isotopes are defined as having the same number of protons, but different number of neutrons

​- atomic number is the same

​- atomic mass is different

Multiple Choice

In a correctly written symbol what would be located in the "A" position?

• number of neutrons
• atomic number
• number of electrons 
• atomic mass

Multiple Choice

What quantities vary between isotopes of an element?

• protons, electrons, and atomic mass
• protons, electrons, and atomic number
• neutrons and electrons
• neutrons and atomic mass

Multiple Choice

Isotopes are atoms of the same element with the same # of _________, different number of ______.

• neutrons;  protons

• protons; neutrons

• e^- ; atomic masses
• n⁰ ; atomic masses

Multiple Choice

How many neutrons in C-14?

• 6
• 7
• 14
• 8

Multiple Choice

What is the planetary model also known as?

• Thomson model

• Plum pudding model

• Bohr model

• Nuclear model

Multiple Choice

What is the charge of an atom that has lost one electron?

• -1
• -2
• +1
• +2

Multiple Choice

An ion forms when an atom gains or loses

• Protons
• Neutrons
• Electrons

Multiple Choice

How many neutrons does the isotope below have?     ⁸⁹ ₃₆Kr

• 53
• 36
• 89
• 125

Multiple Choice

Two isotopes of carbon are carbon-12 and carbon-14.  These isotopes differ from one another by two protons.

• true
• false

Multiple Choice

Which 2 subatomic particles make up most of an atom's mass (mass number)?

• protons and neutrons

• all subatomic particles are equal in number

• neutrons and electrons

• protons and electrons

Multiple Choice

How many electrons does a Copper atom have?

• 63

• 29

• 92

• 34

Multiple Choice

What is the atomic number for an element with 41 neutrons and a mass number of 80?

• 39
• 41
• 80
• 121

Multiple Choice

An element is defined by its number of ...

• protons

• electrons

• neutrons

• protons + electrons

Multiple Choice

Negative ions ____ electrons.

• Cations
• Gain

• Anions
• Lose

Multiple Choice

What charge does an atom have if it GAINS an electrons?

• Positive (+)
• Negative (-)

Multiple Choice

What charge does an atom have if it LOSES an electron? 

• Positive (+)
• Negative (-)

Multiple Choice

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

• 74.92 amu
• 24.97 amu
• 75.01 amu
• 74.51 amu

Multiple Choice

Naturally occurring chlorine that is put in pools is: 75.53% chlorine with a mass of 34.969 amu and 24.47% chlorine with a mass of 36.966 amu. Calculate the average atomic mass.

• 35.46 amu

• 35.00 amu

• 37.00 amu

• 17.00 amu